This Autographed White Pinstripe Majestic Cooperstown Collection Limited Edition #11/23 Jersey with the inscription of "Hit Man, Donnie Baseball, 1985 AL MVP, 9x G.G." has been Personally Signed by Don Mattingly of the New York Yankees. This item is 100% Authentic to includes a numbered hologram by Fanatics. The authenticity can be verified on Fanatics website. This is a Large sized Jersey.